RibbonForm problem in Windows Vista with Aero

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When I run my WindowForm app on Windows Vista with Aero, the RibbonForm does not show the Minimize, Restore, Close icons on the top-right corner. I notice that this app runs properly on Windows XP. It also runs properly on Windows Vista without Aero.

Is there anyway to resolve this problem? May I turn off Aero feature of RibbonForm?

There are 2 clients inform me the same error above. They are using laptops with hight configuration (CPU T7xxx, 3GB RAM, Windows Vista Premium). I also tested my app on a Sony laptop that runs on Windows Vista Premium and I see the error occurs as in the attached image.